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含氰废水选择性浸出酸化渣中铜的试验研究
- 张建元|李名新|王洪凯|孙宏志|顾维鹏
- 作者单位：
- 辽宁新都黄金有限责任公司|东北大学冶金学院|辽宁新都黄金有限责任公司|辽宁新都黄金有限责任公司|辽宁新都黄金有限责任公司
基金项目：
- isnull
详细信息：
- 作者简介：
- 张建元（1968—），男，陕西横山人，高级工程师，从事黄金冶炼管理工作；辽宁省朝阳市双塔区中山大街北段九号，辽宁新都黄金有限责任公司，122000；E-mail：xdhjshz@163.com
- 通讯作者：
- E-mail：whk681207@163.com，13842186516
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Selective leaching of copper from acidified residue by cyanide-containing wastewater
- English Author：
- Liaoning Xindu Gold Co.,Ltd.|School of Metallurgy,Northeastern University|Liaoning Xindu Gold Co.,Ltd.|Liaoning Xindu Gold Co.,Ltd.|Liaoning Xindu Gold Co.,Ltd.
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
针对某黄金冶炼企业酸化渣中铜的回收进行研究，提出利用含氰废水浸出酸化渣中的铜。通过控制浸出条件（浸出温度、初始pH和浸出时间）以抑制锌、铁浸出，达到溶液净化的目的，便于后续铜的富集与回收。利用热力学计算和浸出试验相结合，研究酸化渣中铜的浸出和锌、铁净化反应路径。热力学计算结果表明：在碱性条件下，当n（总氰化合物）/n（Cu）=1.71时，硫氰化亚铜被游离氰化物络合全部转化为Cu-CN络合物；当n（总氰化合物）/n（Cu）=5.0时，与锌络合的氰化物被铜全部占据形成Cu-CN络合物。在浸出温度333.15 K，初始pH值11.0，浸出时间120 min和液固比100∶1的条件下，铜浸出率可达99.72 %；浸出液中锌和铁质量浓度几乎为零，二者主要以Na2Zn3[Fe(CN)6]2沉淀形式进入浸出渣中。
关键词:
含氰废水；酸化渣；铜；碱性浸出；净化
Abstract:
The copper recovery from acidified residue in gold smelters is studied,and the use of cyanide-containing wastewater for the copper recovery from acidified residue is proposed.The leaching conditions(leaching temperature,inital pH and leaching time)are controlled to suppress zinc and iron leaching and meet the goal of solution purification,which is convenient for subsequent copper enrichment and recovery.The study combined thermodynamic calculations and leaching experiments,and looked into the reaction pathways of copper leaching from acidified residue and zinc and iron purification.Thermodynamic calculations indicated that under alkaline conditions,when n(total cyanide)/n(Cu)is 1.71,cuprous thiocyanate was completely transformed into Cu-CN species in the presence of free cyanide ion;when n(total cyanide)/n(Zn)is 5.0,all cyanide complexes with zinc was stripped by copper,forming Cu-CN complex.When the leaching temperature is 333.15 K,initial pH is 11.0,leaching time is 120 min and liquid-solid ratio is 100∶1,the leaching rate of copper can be up to 99.72 %,and the mass concentration of zinc and iron,both of which precipitate in the form of Na2Zn3[Fe(CN)6]2 into the leaching residue,is nearly zero in the leaching solution.
Keywords:
cyanide-containing wastewater;acidified residue;copper;alkaline leaching;purification
